<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <div>
            <ul>
                <li v-for="item in list">{{item.num}} <button @click="del(item.id)">删除</button></li>
            </ul>
            <button @click="add">生成</button>
        </div>
    </div>
    <script src="../vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                list: [
                    { id: 1, num: 1 },
                    { id: 2, num: 6 },
                    { id: 3, num: 9 },
                    { id: 4, num: 4 },
                    { id: 5, num: 7 }
                ]
            },
            methods: {
                del(id) {
                    this.list = this.list.filter(item => item.id !== id)
                },
                add() {
                    this.list.push({
                        id: this.list.length + 1,
                        num: Math.floor(Math.random() * 20)
                    })
                }
            }
        })
    </script>
</body>

</html>